Model version generation issue #21871

When specifying a model in the readme in the following manner:

engine:
  id: claude
  model: claude-sonnet-4.6

and running gh aw compile, the corresponding yaml generated is:
--model claude-sonnet-4.6

as opposed to (based on claude's documentation):
--model claude-sonnet-4-6
.

This results in the workflow failing when run in CI. Example error:

"result":"There's an issue with the selected model (claude-sonnet-4.6). It may not exist or you may not have access to it. Run --model to pick a different model."